Meshiuma (メシウマ) is a Japanese slang word originating from 2channel, which is a shortened version of 他人の不幸でメシがうまい (tanin no fukou
de meshi ga umai), whose meaning is "Other people's misfortunes make the food
tasty", which is a metaphor for "getting aroused from the misfortunes of others", thus it's the Japanese word for "
schadenfreude".